'Sherlock' Season 4 Starts Filming, See the Brief Teaser

The game is on! "Sherlock" Season 4 is now filming in the U.K., after a loooooong absence, apart from the Victorian special. Benedict Cumberbatch and Martin Freeman are back as modern-day Sherlock Holmes and John Watson, with co-creator/writer/actor Mark Gatiss (Mycroft Holmes) announcing the good news on Twitter via a brief but dramatic and foggy little video:

Nice. According to Deadline, the three-part Season 4 could premiere on January 1, 2017, but there's no official date yet.

Cumberbatch, Steven Moffat and Mark Gatiss are all excited to return to work, with the actor saying he's "genuinely thrilled to be back filming Sherlock with all the cast and crew. I can't wait for everyone to see season four. But you will have to wait... though not for long... And it will be worth it." Moffat and Gatiss added, "Sherlock series four — here we go again! Whatever else we do, wherever we all go, all roads lead back to Baker Street — and it always feels like coming home. Ghosts of the past are rising in the lives of Sherlock Holmes and John Watson bringing adventure, romance and terror in their wake."

Amanda Abbington is returning as John Watson's wife Mary, and they'll be preparing for the arrival of their first child. We should also prepare for more from Moriarty (Andrew Scott). As Gatiss previously teased to Entertainment Weekly of Season 4, "All I can say is, this is a major, life-changing series for the regulars. The repercussions of Moriarty's apparent return are far-reaching. It's very big stuff."